Yo mama's so old, her social security number is one.
Yo Mama's Old Number
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is saying yo mama is so ancient that her social security number, which is supposed to be a unique ID for folks, is literally the number "one". That means she's been around since dirt was invented. And I bet you still ask her for money!